Effect of Cutting Gases on the Hardness of Thermally Cut High Strenght Steels

Kuti, János and Fábián, Enikő Réka and Gáti, József (2024) Effect of Cutting Gases on the Hardness of Thermally Cut High Strenght Steels. ACTA MATERIALIA TRANSYLVANICA (EN), 7 (2). pp. 82-87. ISSN 2601-8799

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Abstract

In this work, it was illustrating the consequences of flame cutting on XAR® 400 and S960Q type high-strengthsteels. During flame cutting, the metal, locally heated to ignition temperature, burns in the oxygen beam andremoves the resulting combustion product from the kerf. As a result of the process, chemical and physicalchanges occur in the microstructure of the steel, which can have a significant effect on its properties. Examining the microstructural transformations due to flame cutting of high-strength steels is essential fromthe point of view of proper design and production. In case of XAR® 400 steel quality, increasing the cuttingoxygen significantly changes the microstructure, with a high reduction in hardness in the heat affected zoneat cutting zone. For S960Q steel, flame cutting does not cause a drastic change in the microstructure of steel,and increasing the amount of cutting oxygen does not significantly change the hardness.

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